Leading in device for metallic vacuum-discharge containers



April 9, 1935. w. DALLENBACH 1,997,361

LEADING-IN DEVICE FOR METALLIC VACUUM DISCHARGE CONTAINERS Filed March 28, 1929 r if Patented Apr. 9, 1935 LEA-DENQ-JN DEIVIOE :FQR :META'LLIG rYAQHIlM-QISGHARGE (.GQNEEAINER'S walt 'lli llsnhaa zur hlfirritletlan hnnl c tiqnrluamhsfiii, 1 929, qSerial No. 3505 a l ri 1'1, 21928 .3 Cla s- Ql- @5012'15) 'iEhis inventiomrela-testodeading in devices ror vessel consists ,cf gtwo resilient :tubular :pa F, metallic vacuumedischar e icontainers. a vacuum-sealing insulator J :rbetweengthese parts "The specification of my1U. SJPfitBIlt Number l t-and the ,wallW zproperiof :the vessel. ,Aninsu- 1363,4511) discloses anumberiof constructions of zlatingsupporting.deviceicomprising a metahcap f5 zancinsulatingdeviceiwhichfmec-hanicallysupports -K, aimetal eflanged iringvB, and insulators I 1 ;be,- ,5

the conductor von the wall lot the container. :tween these :two :membersengages theiconductor Among :these :fihere is one pf particular impor- .L :at .near the place designated is .where the tance :in which s-the insulating supportin :dfiliQe conductor L.passes h 0ugh. the wa liofzth t ssc :is situated entirely outside the :yacuum ivess l, Forces in z n-th el ct ode -:E will :b t e-t .10 and the present dnventi-on has fgr one of its cause smaller displacements of the partsat S the ,10

aobjects-tojmproye thatconst tion of lea ding in nearer the ,pointUis itofs. idevicenandto prctect s comp le lgy pos ble p li y .Of supper-ting insulators I1 Q from mechanical st sses the insulatqr which example-zthreeane arrangediaroundzthe insulator serves to seal the 135a urn. 1 :J as (shown -;in Fig. 22. :Sufiicient space is prong to the inventipn the insulajging supvided :between .these insulators which flatter ;.are :15 porting device engages :the conductor near ain:theeformi-ofzpillarscfor .airtopirculate about place Whe e th s nductor pas s through {the the surfacevof the insulat rtandcool the leadvwall of the container. -.ing,-:in device.

eiccording to a igature j ,the invention, the zfteferringtpzl figuresfi andAutheyicld n -parts :0 insulating device concentrically the of the wall of the vessel shown in Figure i1,;as 2 0 vacuum-sealing.insulatorandjormse,liguidconresilient tubes are, in this construction, {formed tainer ,in such a manner that the electric field 'asrdia-phragms .El and F2 .gf sheet gnetal. It is tending 'to cause a flash-over on the outside of preferable :to imake ;the ;upper ,diaphragni ;F,1 the vacuum-sealing insulator is situated in an double and the lower diaphragm F2 single. For

:5 insulating liquid, such as oil. if the electrode holder is deflected from its ver- When the insulating supporting device 'comtical position through a small angle sideways prises several parts, according to another feature by a force applied to the electrode, the axis of of the invention the same is built up of several the insulator J will also be deflected through a supporting insulators in the form of pillars arsmall angle, owing to the lateral displacement ranged around the vacuum-sealing insulator. of the point S, but in the opposite direction. The 30 According to a further feature of the invenrelative rotation of the axis of the parts L and J tion, on the atmospheric side, the place of lowest with respect to the electrode holder at S must potential difference between the conductor and therefore be taken up by the upper diaphragm metallic vacuum-vessel is placed so far from the F1 while the lower diaphragm F2 has only to vacuum-sealing insulator that the latter will not take up the small angle through which the axis 35 50 of part of the device shown in Figure 3. N with the diaphragm F1. Such welding should be endangered by flashing over. of the parts L and J is deflected relatively to the Other features of the invention will be devertical. If the three single diaphragms have scribed hereinafter and pointed out in the claims. the same dimensions, they will be stressed in a Two embodiments of the invention are diasimilar manner during a lateral deflection of grammatically illustrated by way of example in the electrode holder. the accompanying drawing whereinz- At N are situated welded joints or seams along Figure 1 is a vertical cross-sectional elevation which the diaphragms are connected with the showing one form of leading-in device accordextension tubes of the insulator J and with the ing to the invention, wall of the vessel.

Fig. 2 is a transverse sectional view of the lead- The place S where the upper diaphragm F1 is ing-in device shown in Fig. 1. connected to the leading-in conductor L is of Fig. 3 is a vertical cross sectional view of a particular interest and is shown enlarged in second form of the invention. Figure 4. The conductor L has a collar or skirt Figure 4 is a detail view, on an enlarged scale, K which may be welded along its free edge at Like reference characters designate like parts be effected with a small flame to avoid heating throughout the several views. the entire conductor L and to obviate stresses Referring first to Figure 1, a leading-in conwhich might occur in the seam N if the conductor L having an electrode E passes through ductor L itself were Welded directly to the diathe wall of a metallic vacuum-vessel at S. This phragm F1.

One or more screens R1, R2 may be attached to the wall W of the vessel for protecting the lower diaphragm F2 from heat radiated by the electrode. V

In this construction the members B, I, K form together with the wall W a receptacle which concentrically surrounds the vacuum-sealing insulator J and can be filled with an insulating liquid, e. g. oil so that the electric field tending to cause a flash over on the outside of the insulator is situated in this liquid, preferablyoil. If the lengths of the creeping paths over the insulators J and I are not different, a flash over will always occur on the outside of the insulator making the creeping paths .over the insulators J and I sufiiciently difierent inlen'gth, or, in general, by arranging that on the atmospheric side the places of lowest flash-over potential-dinerence between the conductor L and the' wall W of the metal vessel areiplaced so far from the vacuum-sealing insulator J that the latter will -'not be endangered by breakdowns of the dielectric. r l

The above described advantages and the devices claimed hereinafter'are independent of the position at which connection is made to the current supply. In general, the upper end of the conductor L will be used for. that purpose, but other parts which are in electrical connection with the electrode may serve for leading-in current, thus, for example, the upper-tube which is hermetically connected with the insulatorJ may be used. r

I claim:--

1. In combination, a metallic vacuum discharge container including a wall constituted in part by two metal parts and a vacuum-sealing insulator between said metal parts, a leading-in conductor passing through one of said wall parts, a device insulating and securing said conductor to said wall of the container, said device being located wholly outside the vacuum, and disposed concentric with said insulator, and engaging the conductor adjacent the point where the latter passes through the wall part and forming, together with the said insulator, a chamber containing an insulating liquid, in which the electric field tending to cause a flash-over on the outside'of the vacuum-sealing insulator is situated.

2. In combination, a metallic vacuum discharge container including a wall constituted in part by two metal parts andan interposed vacuum-sealing insulator, one of said metal parts being in the form of a double diaphragm and the other part in the form of a single diaphragm, a leading-in conductor passing vacuum-tight through said double diaphragm, and a device insulating and securing said conductor to said wall of the container, said device being located wholly outside the vacuum and engaging the conductor adjacent the point where the latter passes through the double diaphragm.

second mentioned diaphragm from the heat of an electrode carried by said conductor.

' WALTER DALLENBACH. 

